Use the crosses and throw the others in the trash where they belong. Just poke one leg of the spacer in the grout joint and call it good. That way you have a handle to grab later when you take them out.
By the way...
You are splitting hairs needlessly when you try to compare spacers using a micrometer. Forget about it, if a spacer is a silly millimeter larger or smaller than another spacer - so what. The tile doesn't care, the grout doesn't care, and no one will ever notice the variance.
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